http://www.rug.nl/research/portal/files/41711829/cesifo1_wp6448.pdf
http://fedtrust.co.uk/our-work-on-europe/hard-brexit-international-trade-and-the-wto-scenario/
https://www.cer.eu/sites/default/files/insight_SL_5.11.19_2.pdf
http://www.voxeurop.eu/en/2017/eu-uk-relations-5120821